JAMB - Biology (2000 - No. 30)
I. High birth rate and high immigration rate II. Low birth rate and high immigration rate III. Low mortality rate and low emigration IV. High mortality rate and high emigration rate. Which combination of the above can cause rapid over-crowding in climax biotic communities and human settlements?
II and III
I and III
I and IV
I and II
Објашњење
High birth rate and high immigration rate II. Low birth rate and high immigration rate III. Low mortality rate and low emigration IV. High mortality rate and high emigration rate.
High birth rate rate, high rate at which people move into the country, low mortality( reduction in death rate) and low emigration (rate at which people migrate out from the country) all increase the population rapidly. Therefore, I & III are correct, hence option B is the correct answer.